Pension and retirement plans (Periodic Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jul. 02, 2022	Jun. 28, 2025
Components of net periodic pension costs
Service cost within selling, general and administrative expenses	$ 10,252	$ 12,015	$ 15,007
Interest cost	$ 24,579	$ 26,730	$ 15,787
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Expected return on plan assets	$ (39,941)	$ (48,860)	$ (49,135)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Amortization of prior service cost	$ 4	$ 4	$ 4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Recognized net actuarial loss	$ 223	$ 2,469	$ 16,343
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Net loss recognized due to benefit obligation settlement		$ (37,350)
Net periodic pension (benefit) cost	$ (4,883)	29,708	$ (1,994)
Contributions	8,000	8,000
Settlement expenses		(37,350)
Other Income, net
Components of net periodic pension costs
Net periodic pension (benefit) cost	$ (15,135)	$ 17,693	$ (17,001)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Forecast
Components of net periodic pension costs
Estimated future employer pension plan contributions				$ 8,000